Improve qgsmessagelog doc strings

Author: Éric Lemoine

python/core/auto_generated/qgsmessagelog.sip.in

@@ -108,7 +108,7 @@ class QgsMessageLogConsole : QObject
 Default implementation of message logging interface
 
 This class outputs log messages to the standard error. Therefore it might
-be the right choice for apps without GUI.
+be the right choice for applications without GUI.
 %End
 
 %TypeHeaderCode
@@ -125,18 +125,20 @@ Constructor for QgsMessageLogConsole.
 
     QString formatLogMessage( const QString &message, const QString &tag, Qgis::MessageLevel level = Qgis::Info ) const;
 %Docstring
-Format a log message. Used by child classes.
+Formats a log message. Used by child classes.
 
 :param message: the message to format
 :param tag: the tag of the message
 :param level: the log level of the message
+
+.. versionadded:: 3.4
 %End
 
   public slots:
 
     void logMessage( const QString &message, const QString &tag, Qgis::MessageLevel level );
 %Docstring
-Log a message to stderr.
+Logs a message to stderr.
 
 :param message: the message to format
 :param tag: the tag of the message

src/core/qgsmessagelog.h

@@ -131,7 +131,7 @@ class CORE_EXPORT QgsMessageLogNotifyBlocker
  * \brief Default implementation of message logging interface
  *
  * This class outputs log messages to the standard error. Therefore it might
- * be the right choice for apps without GUI.
+ * be the right choice for applications without GUI.
  */
 class CORE_EXPORT QgsMessageLogConsole : public QObject
 {
@@ -147,18 +147,19 @@ class CORE_EXPORT QgsMessageLogConsole : public QObject
   protected:
 
     /**
-     * Format a log message. Used by child classes.
+     * Formats a log message. Used by child classes.
      *
      * \param message the message to format
      * \param tag the tag of the message
      * \param level the log level of the message
+     * \since QGIS 3.4
      */
     QString formatLogMessage( const QString &message, const QString &tag, Qgis::MessageLevel level = Qgis::Info ) const;
 
   public slots:
 
     /**
-     * Log a message to stderr.
+     * Logs a message to stderr.
      *
      * \param message the message to format
      * \param tag the tag of the message